A device is only as secure as its least secure means of authentication. If Face ID is indeed more secure than Touch ID, having both does nothing for the people who ignore Face ID and continue to stick solely with Touch ID.
Dropping Touch ID is the right move here.
You are aware that biometric authentication is not required? Most people don't use MFA, and I believe there's a huge number with PIN only.
I would like no notch, all screen iPhone, fingerprint scanner under display. FaceID is working well, but notch is the worst.